Another one with legacy to be approved from kinto has been blocked for your protection.

Why was it blocked?

Another one with legacy to be approved from kinto

What does this mean?

The problematic add-on or plugin will be automatically disabled and no longer usable.

When Mozilla becomes aware of add-ons, plugins, or other third-party software that seriously compromises Firefox security, stability, or performance and meets certain criteria, the software may be blocked from general use. For more information, please read this support article.